What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » P1703

Code P1703

Symptoms

• Check Engine Light is on

• Vehicle stuck in one gear

• Erratic shifting or transmission performance

Common Causes

• Faulty transmission mode switch

• Wiring issues or poor connections

• Malfunctioning transmission control module

Glossary

Transmission Mode Switch: A component that communicates the driver's gear selection to the vehicle's computer.

Transmission Control Module: An electronic component that controls the transmission's operation.

Related Codes

• P0705

• P0706

Official description

Transmission Mode Switch Malfunction

Laymans terms

The car's computer is having trouble understanding what gear you want to be in.

Explanation

The transmission mode switch is responsible for communicating the driver's gear selection to the vehicle's computer. A malfunction can cause incorrect gear operation.

Technical description

P1703 indicates that the transmission mode switch, which tells the vehicle's computer what gear the driver has selected, is not functioning properly. This could be due to an electrical fault, a mechanical issue, or a problem with the switch itself.

Diagnosis steps

• Check for other related codes

• Inspect the transmission mode switch and wiring

• Test the transmission control module

Repair procedures

• Replace the transmission mode switch

• Repair or replace damaged wiring

• Reprogram or replace the transmission control module

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$150 - $400

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Honda Accord

• Toyota Camry

Preventive measures

• Regularly check and maintain transmission fluid levels

• Inspect wiring for wear and tear

• Ensure proper gear engagement

Error code type

Transmission Issue

User experience recommendations

• Avoid driving the vehicle until repaired to prevent further damage.

• Consult with a professional mechanic for a detailed diagnosis.

Warranty information

Check with your vehicle manufacturer for specific warranty coverage related to the transmission system.

Historical data

P1703 has been a common code for vehicles with electronic transmission controls, especially in models with complex gear systems.

Urgency level

Moderate – It is important to address this issue to avoid potential transmission damage.

Legal and safety notice

Driving with a malfunctioning transmission can be unsafe and may lead to further mechanical issues.

Testing conditions

• Vehicle in park

• Engine running

Component location

The transmission mode switch is typically located on the side of the transmission or near the gear shifter.

FAQs

Q: Can I drive with a P1703 code?
A: It's not recommended, as it may cause further damage to the transmission.

Q: How do I reset the P1703 code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.

Last updated: Apr 16, 2026 • Source: internal database

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